1/4-20 x 3/8" 內六角圓頭螺絲 | 圓頭內六角驅動 | 尼龍防鬆劑 | 全牙 | 合金鋼熱處理黑色氧化 (100個/包)

The hex socket drive made installation quick and precise with my Allen wrench, and the nylon pellet locking feature gives me confidence these won't vibrate loose in my jig setup.

The black oxide finish on these screws gave my machining fixture a clean, professional look right out of the bag. They drove in smoothly with a hex key and held tight without any stripping. Exactly what I needed for precision assembly work.

Used a handful of these to secure a jig on my drill press and the button head sits flush perfectly without snagging. The thermal black oxide finish looks quality and seems durable.